<nz-card nzTitle="Card Title">
  <h3>Group Title</h3>
  <nz-card nzTitle="Inner Title" nzHoverable>
    <a>Inner Card Content</a>
  </nz-card>
  <nz-card nzTitle="Inner Title" style="margin-top: 16px" nzHoverable>
    <a>Inner Card Content</a>
  </nz-card>
</nz-card>
